How can delete matrix randomly?

       y =[1   2   0.075  0.100  0.000  1.000 
           2   3   0.080  0.110  0.000  1.000
           2   4   0.090  0.180  0.000  1.000
           3   9   0.040  0.040  0.000  1.000 
           4   5   0.040  0.040  0.000  1.000
           1   6   0.110  0.110  0.000  1.000
           5   14  0.090  0.120  0.000  1.000
           6   7   0.080  0.110  0.000  1.000
           6   8   0.110  0.110  0.000  1.000
           7   9   0.110  0.110  0.000  1.000
           7   10  0.080  0.110  0.000  1.000
           8   12  0.040  0.040  0.000  1.000 
           1   11  0.110  0.110  0.000  1.000
           11  12  0.090  0.120  0.000  1.000
           11  13  0.080  0.110  0.000  1.000
           13  14  0.040  0.040  0.000  1.000];

I have matrix y and I want to delete 3 rows randomly. To be like this.

How can I do?

       y =[1   2   0.075  0.100  0.000  1.000 
           2   3   0.080  0.110  0.000  1.000
           2   4   0.090  0.180  0.000  1.000
           4   5   0.040  0.040  0.000  1.000
           1   6   0.110  0.110  0.000  1.000
           6   7   0.080  0.110  0.000  1.000
           6   8   0.110  0.110  0.000  1.000
           7   9   0.110  0.110  0.000  1.000
           7   10  0.080  0.110  0.000  1.000
           1   11  0.110  0.110  0.000  1.000
           11  12  0.090  0.120  0.000  1.000
           11  13  0.080  0.110  0.000  1.000
           13  14  0.040  0.040  0.000  1.000];

Answer 1

[KSSV]

Let y be your matrix:

[nx,ny] = size(y) ; 
idx = randsample(1:nx,3) ; 
y(idx,:) = [] 

Note that, yopu are deleting rows..not columns.

[pongsapak ruangrob]

Thank you for your help.

Answer 2

[Guillaume]

It looks like you've deleted rows not columns.

y(randperm(size(y, 1), 3), :) = [];  %delete 3 rows at random
y(:, randperm(size(y, 2), 3)) = [];  %delete 3 columns at random

[KSSV]

y(randperm(size(y, 1), 3), :) = [];  %delete 3 rows at random
y(:, randperm(size(y, 2), 3)) = [];  %delete 3 columns at random

[Guillaume]

Yes, I spotted the mistake straight away.

[pongsapak ruangrob]

Thank you. That my fault. I need to delete rows.